FR2779491A1 - METHOD AND DEVICE FOR LAYING A RETRACTABLE TUBULAR ELEMENT ON A RECEPTACLE, AND ASSEMBLY THUS OBTAINED - Google Patents

Abstract

The invention relates in particular to a method of installing a retractable element (2) on a receptacle, such as cable. This process involves threading a device (1) onto the receptacle, then removing a tube (5) from the device (1) supporting the element (2) so that it comes to conform to the receptacle, by: - keeping the element (2) in its location; and - exerting on a flexible unitary case (7), extended internally up to near a rear end of the tube (5), a rearward pulling force which causes the simultaneous evacuation of the tube (5) with the case.

Description

l The invention relates to a method and a device for installing an element

  tubular retractable on a receptacle, and a

assembly thus obtained.

  In an example of application, the receptacle is an electrical, optical or other cable, to be protected by a sleeve or the like. The technical field of the invention is therefore that of tools for installing elastic sockets or elements.

  similar retractable, and cable accessories.

  GB-A-1.292.608 describes an elastic element for

  cover and insulate an electric cable.

  To be able to be placed by hand, this elastic element is placed while being strongly stretched on a hollow tube made of hard flexible material, in which a groove is formed.

helical, "V" shaped.

  Once the element in position, the tube is removed by pulling on a strip formed by cutting the tube along the groove. As it is removed, the tube maintains its tubular - or conical - shape and

  the elastic element contracts on the cable.

  The external surface of the support tube is covered if necessary with a secondary composition at low

coefficient of friction.

  This composition is for example an insulating covering film, with conductive paddles with loosening of

  constraint, as described in document US-A-3,349,164.

  While it is expected that the elastic element is cured

with a processing oil.

  If necessary, the cable is coated with sealant at the joint.

  With such a technique, the risks of rupture and poor grip of the strip cut in the tube

  are such that the installation is sometimes difficult.

  While from an industrial point of view, the realization of

  the throat is delicate, and economically unacceptable.

  The document FR-A-2,592,825 describes an auxiliary positioning sleeve, in particular on a large electric cable, of a device comprising at least one

  elastic annular element of clamping.

  The sleeve comprises a rigid, straight and hollow tube, with

  slide on the cable.

  It also includes a flexible film sheath with a low coefficient of friction, fixed peripherally inside one end of the tube. A part of the tube not covered by the sheath, allows the latter to be pulled back, while keeping the elastic element above

from its final location.

  The sheath turns on itself as the tube is withdrawn, and the elastic element is pressed against

against the cable.

  To then be separated from the cable, the sleeve is either extracted via the end where it was introduced. Either a tube split longitudinally from the start or a cut

longitudinal is planned.

  An assembly on the sheath combines in their respective installation positions, auxiliary rings of the type

sealant or insulator.

  With this technique, part of the film remains frequently

  wedged between the cable and the elastic element or the putty.

  Air bubbles are thus trapped and / or the sealant is altered. However at medium voltage, the presence of air between the cable and the putty, produces a phenomenon called "partial discharge", which eventually destroys the end of the cable. Document EP-A-631 357 describes a rigid tube for laying an elastic element of great length and / or of great thickness. A means for guiding and driving a film with a low coefficient of friction is mounted completely free relative to the tube. This means drives the film around

  of a front end and against the inside of the tube.

  This guide and drive means holds the film on the tube, while a largely projecting shoulder constitutes a means of handling the tube for its actuation. This guide and drive means comprises belts either initially secured to the film, or initially independent of the film and secured by

  bonding to the edges of the film on the tube.

  Or again, this drive means is a rigid tube

  interior auxiliary glued to the film.

  A primer line is provided for clearance by

  rupture, of the auxiliary or external tube.

  As in other documents, the establishment of

  the elastic element is carried out here by pulling on the tube.

  Therefore, precise positioning of the elastic element is made difficult because of the risks of parasitic displacement.

  of this element, under the effect of the traction of the tube.

  This problem is all the more troublesome if one or more additional elements such as sealant ring or

  analogues, must be installed with the main element.

  In fact, these additional elements must respect the requirements of exact position and placement placement, so that they can assume their function, by

example of insulation.

  Thus, the complete covering - without air or vacuole - of an electrical conductor stripped by an additional insulating element, and laying without twisting - without causing wrinkles generating loss of tightness -, are part of

these imperatives to respect.

  In practice, no known technique moreover makes it possible to ensure that the laying effort to be provided is such that this laying can be carried out under any conditions,

without being tedious.

  In particular, the installation efforts to be provided are often too great when the accessibility of the rear side of the tube, or when the conditions (ambient humidity, grease, etc.)

his grip is bad.

  While both economically and practically, widely projecting shoulders, tube bores, or

  other known means of taking are undesirable.

  Because of this need to be able to pull on the tube, it is produced in practice, in a massive manner and prohibiting any original longitudinal slot or line

  of breaking point for its release.

  The release of this tube is therefore also tedious.

  Thus, in the case of a long tube and / or a place of installation

  confined, this clearance sometimes requires cutting the tube.

  The invention aims to overcome these drawbacks in particular.

  Thanks to the invention, the installation is done exclusively using traction means on the case, which are flexible and therefore inexpensive and easily gripped.

  In addition, it avoids having to pull directly on the tube.

  To this end, a first object of the invention is a method of laying at least one tubular retractable element on a receptacle such as cable or the like, at a precise destination location on the receptacle and using a

installation device.

  This device comprises at least: a hollow rigid tube able to be freely threaded on the receptacle and on the outside of which the element to be placed is initially mounted tensioned; and relative sliding means with a low coefficient of friction, temporarily secured by clamping and interposed between the tube and the elastic element. The method provides for the device to be threaded onto the receptacle so that the retractable element is brought to the right of its precise destination location, then to evacuate the tube so that, as it is withdrawn, the element retractable conforms to the receptacle. According to one characteristic, the retractable element is installed, by: maintaining the retractable element at its precise destination location; and - exerting on traction means, comprising a flexible unitary case of substantially inextensible synthetic material, extended externally over at least part of the tube to form a free external end for receiving the retractable element, and internally from a cuff near a rear end of the tube, a rearward pulling force which, on the one hand ensures the installation of the retractable element on the receptacle and on the other hand causes the simultaneous evacuation of the tube with the case. The installation is therefore carried out substantially without effort by

  the operator directly on the tube.

  A feature provides, in particular in the case of a long element, with a device comprising two tubes and holsters end-to-end longitudinally substantially opposite, that is exerted, successively or simultaneously, on two traction means substantially opposite longitudinally, respectively a backward effort, in an opposite direction. According to another characteristic, following the installation of the retractable element, there is provided a step of removing or evacuating the evacuated tube and / or the case removed, by moving and / or separating strips of the latter over any its longitudinal dimension, along at least one slot capable of allowing, once separated, the passage through

  from it, from the receptacle with the retractable element placed.

  In one embodiment, the step of removing the tube comprises at least one phase of relative separation, for example tangential, of at least two strips of longitudinal tube initially distinct, having previously been part of, or constituted the tube, by juxtaposition and or

  assembly, for example by elastic stapling.

  One embodiment provides that the step of removing the tube comprises at least one phase of mutual separation, for example radial, of at least two edges of unitary longitudinal strips, for example connected by a zone

preferential termination.

  In an embodiment where the means for removing the case comprise at least two bands, the step of pulling exerted on the case is in particular carried out by handling by a band operator arranged in a prehensible braid. According to one characteristic, following the installation of the elastic element, a step of longitudinal fragmentation of the tube is provided, in at least two sections or rings

of tube.

  In one embodiment, the fragmentation step comprises at least one phase of segmenting sections of tube previously secured, for example by elastic stapling and / or sections previously unitary by

  example via at least one preferential rupture zone.

  A second object of the invention is a device for installing at least one tubular retractable element on a receptacle such as cable or the like, at a location for

  precise destination on the receptacle.

  This device comprises at least: - a hollow rigid tube able to be freely threaded on the receptacle and on the outside of which the element to be placed is initially mounted tensioned; and - relative sliding means with a low coefficient of friction, temporarily secured by clamping and

  interposed between the tube and the retractable element.

  This device allows threading on the receptacle of the retractable element in line with its precise destination location, then the evacuation of the tube so that

  the retractable element conforms to the receptacle.

  According to one characteristic, the relative sliding means comprise a flexible unitary case of substantially inextensible synthetic material, extended externally over at least part of the tube to form a rear free external end for receiving the retractable element, and extended internally from a hem. cusp up to beyond a rear end of the tube, directly or by means of internal flexible strips,

  to form traction means on the case.

  While the outer peripheral wall of the tube is substantially devoid of gripping means such as

projection and / or through cavity.

  In one embodiment, the outer peripheral wall of the

  tube is substantially smooth and devoid of discontinuity.

  According to one characteristic, the tube has a substantially circular section, transverse to its longitudinal direction, and for example cylindrical with generator

  substantially parallel to this longitudinal direction.

  According to another characteristic, the tube has a section, transverse to its longitudinal direction,

  substantially polygonal, for example dodecahedral.

  According to yet another characteristic, the external peripheral wall of the tube has an inclined generator, from the inside towards the outside radially and from front to back in a direction of traction of the case in the longitudinal direction, with respect to it. ci, by an angle of the order of 2 to 15, and for example of the order of 7 to

80.

  This participates in an easy extraction.

  One characteristic provides, in particular in the case of a long element, that the device comprises two tubes as well as two end-to-end cases longitudinally opposite each other, and therefore two traction means

  substantially opposite longitudinally.

  According to another characteristic, the tube and / or the case comprises means for removal after installation by separation from and / or distance into at least two strips, respectively of the tube and / or of the case. For example, the tube and / or the case comprises from two to twelve bands. In one embodiment, the means for removing the tube comprise at least two bands to be moved away, substantially longitudinal and initially distinct, for example

juxtaposed and / or assembled.

  For example, the means for removing the tube comprise at least one securing slot by elastic stapling of strips to be removed, substantially extended over a whole

  generator of the tube, in the longitudinal direction.

  Another embodiment provides that the means for removing the tube comprise at least two strips to be separated,

  substantially longitudinal and previously unitary.

  For example, the strips are connected via a preferential rupture zone, substantially extended over a whole

  generator of the tube, in the longitudinal direction.

  According to one characteristic, the tube comprises means for longitudinally dividing the tube into at least two

tube sections or rings.

  For example, the tube has two to ten sections or

tube rings.

  In one embodiment, the splitting means comprise a segmentation system, for example of sections previously secured by elastic stapling and / or of sections previously unitary by breaking along a

preferential area.

  According to one embodiment, the case is internally extended towards the rear by at least two flexible strips, for example two strips are each fixed to the case to form two grip handles, the fixing points being substantially evenly distributed over the suburbs

  the rear end of the case.

  A third object of the invention is an assembly obtained by implementing the method and / or comprising at least

  a device as mentioned above.

  Examples of embodiment of the invention are set out

  in the detailed description which follows, and refers to

attached drawings.

  In these drawings, FIG. 1 is a partial schematic view in transverse longitudinal section, illustrating a step of threading a laying process

according to the invention.

  Figure 2 is a partial schematic half-view in transverse longitudinal section, illustrating a subsequent step of holding and pulling, of the laying process. Figure 3 is a partial schematic view in transverse longitudinal section, of an example of a retractable element placed on an electric cable, according to the invention. Figure 4 is a partial schematic view in transverse longitudinal section, of another example according to the invention, of device comprising at its front end, a profiled end cap, with conical positioning section. FIGS. 5, 6 and 8 are partial schematic views in perspective of rear longitudinal elevation,

  examples of tubes according to the invention.

  Figure 7 is an enlarged partial schematic view of detail VII of Figure 6, which illustrates an embodiment of grinding means with elastic stapling, according to the invention. FIG. 9 is a partial schematic view in longitudinal elevation section of a device with two tubes and

  two end-to-end cases, before installation.

  Figure 10 is a schematic cross-sectional half view of a multi-band device case

  longitudinally separable and arranged in braid.

  Figure 11 is a view of the retractable element fitting device of Figure 4, in longitudinal section transversely. Figure 12 is a view of the delivery device of Figure 11, without retractable element, in rear perspective

longitudinal and transverse.

  In the figures, mutually orthogonal directions X, Y and Z are shown. The direction X called longitudinal, and the direction Y said

  transverse, are considered to be substantially horizontal.

  While the direction Z called elevation is considered

substantially vertical.

  The invention is described here with reference to these directions X, Y and Z. For rotating parts, the term radial designates any direction substantially in a plane perpendicular to the longitudinal direction X, such as the transverse directions Y and elevation Z. The constituents of the invention are described in their current positions and orientations of use. But it goes without saying that they can take various positions or orientations. This is particularly the case for displaceable or deformable components. Likewise, the storage positions and orientations of the constituents of the invention may be different. These positions and orientations are therefore indicated

only for explanatory purposes.

  It is specified here that the terms "front" and "rear" are considered respectively as indicating an upstream and downstream location according to a defined laying direction, in the longitudinal direction X, and indicated in the figures by

the corresponding arrow.

  And that the terms "elevation", "longitudinally" and "transversely" refer to the corresponding directions. In the figures, the reference numeral 1 designates a device for fitting a retractable tubular element 2,

  on a receptacle 3 such as cable or the like.

  This installation must be, for the reasons mentioned above, carried out at a specific destination location on the

receptacle 3.

  In embodiments not illustrated, a single device 1 is used for installing several retractable elements 2, in series one after the other on a common receptacle 3. Conversely, as explained below in connection with FIG. 9, a single retractable element 2, in particular of large dimension in the longitudinal direction

  X, is placed with a device 1 called double.

  Once the installation has been carried out, the retractable element 2 and the cable 3 form an assembly designated at 4, such as that

seen in Figure 3.

  In this FIG. 3 specifically, the assembly 4 comprises a connection of two parts 3a and 3b of an electric cable

3 for high voltage (HTA).

  On such a cable 3, it is imperative to add (at the ends of the two parts 3a and 3b connected one to the other end-to-end), an element 2 forming an accessory of

  distribution of electric and insulation fields.

  FIG. 4 illustrates another example, where the receptacle 3 is an electrical cable for high voltage (MV), at a free end of which is placed, using the device 1, an elastic sheath for protection and insulation, which forms

item 2.

  Obviously, many other types of retractable or elastic elements 2, similar in structure, but of different destination or function, are concerned.

by the invention.

  Thus, elements 2 such as optical cable, mechanical cord, electronic conductive braid or other similar retractable tubular member, can be laid using

of a device 1.

  For this purpose, such a device 1 generally comprises, at least: a hollow rigid tube 5 able to be threaded freely on the receptacle 3 and on the outside of which the element 2 to be placed is initially mounted tensioned; and - means 6 for relative sliding with a low coefficient of friction, temporarily secured by clamping

  and interposed between the tube 5 and the retractable element 2.

  It should be noted here that according to the invention, the sliding means 6 are just temporarily inserted between the outside of the tube 5 and the inside of the element 2, without bonding, welding, stapling or other permanent joining. These sliding means 6 are thus, pending installation, temporarily held on the tube 5 with the retractable element 2, only by the tension of the latter on

the tube 5.

  In the illustrated embodiments, the means 6 comprise a non-stick film of synthetic material, for example

  with polyvinyl, polyethylene, polyester or the like.

  In these embodiments, the film is dry, but implementations of the invention provide for coating, at least locally, with a fatty material such as silicone or the like. In an embodiment not illustrated, the film of the sliding means 6 is multilayer. While in Figures 1 to 4 and 9, the sliding means 6 are constituted by a

single layer plastic film.

  We already understand that this device 1 allows the element 2 to be threaded onto the receptacle 3, in line with its precise destination location, then the evacuation of the tube 5 so that this element 2 comes to conform by

retracting to receptacle 3.

  By relative sliding of the means 6, it is meant that these means promote the movement of the element 2 relative

to tube 5, during installation.

  The tension of the element 2, associated with the surface quality of the means 6, allows the latter not to slide relative to the element 2, as long as a laying traction is not

not exerted on it.

  Here, the sliding means 6 comprise a case

  unitary 7 flexible but substantially inextensible.

  This case 7 is, in the figures, made of synthetic material.

  With the exception of the example of FIG. 4, the illustrated embodiments of the invention in fact provide that the sliding means 6 essentially comprise, or even are

formed by, this unitary case 7.

  This case 7 is extended externally over at least part of the tube 5 to form an external free end

  rear receiving element 2 retractable.

  In FIGS. 1 to 4 and 9, the case 7 is extended externally over a part of the tube 5 longitudinally between a front end piece 8 of the tube and at least one

opposite end 9 said rear.

  In Figure 1 for example, the front end piece 8 is on the right, while the end piece 9 is on the left. It is understood that the direction X in the figures, goes from the front end piece 8 towards the end piece

rear 9.

  To the right of the front end piece 8, the film of the case 7 forms a cusp. More specifically, the tip 8 is surrounded by a hem 10, that is to say an elbow to return to the rear. Note here that it is avoided, as far as possible, to give the front end piece 8 an angular shape, which could

  brake or hang the film of the case 7, during installation.

  Inside, the case 7 is extended from a cuff hem to near a rear end of the end piece 9, to form means 11 of traction on

case 7.

  In FIGS. 1 and 2, the case 7 is extended internally in the longitudinal direction X, up to beyond the rear end of the tube 5. In fact, the case 7 projects

towards the rear of the tube 5.

  It is directly a rear protruding part 12 of this

  case 7, which then acts here as traction means 11.

  To this end, this projecting part 12 can be shaped,

  for example in braid, to improve its grip.

  This is the case in FIG. 10, where the case 7 is made up of longitudinal bands, mutually overlapping

  along the periphery of the case 7.

  By cons, in Figure 4 the case 7 is extended substantially to the right of this end, and the tube

  5 is extended by a cover 13 at the rear end.

  This cover 13 makes it possible to position the assembly formed by the

  rest of the device 1, relative to the receiving cable 3.

  Although this is not apparent from Figure 4, the cover 13

  is made of translucent transparent material.

  In an embodiment not shown, the tube 5 and the cover 13 are unitary, for example obtained by injection molding. Then, the rear end piece 9 is located at the location in FIG. 4, of the rear wall perpendicular to the direction X of this cover 13. Such positioning is particularly appreciable in the case of a cable end 3 of the type HTA, since the

  laying is generally a site operation.

  Still in FIG. 4, in addition to the case 7, the traction means 11 have gripping straps 14 which are made rigidly integral with this case 7, in particular in the longitudinal direction X. Each strap 14

  passes through a light formed in the cover 13.

  It is also noted in FIGS. 11 and 12 that the case 7 proper is made rigidly secured to the ends of the strap 14, respectively by a point of

  fixing 25, such as bonding point or welding.

  It appears from the figures that the external peripheral wall of the tube 5 is substantially devoid of gripping means such as projection and / or through cavity, between its

bits 8 and 9.

  In the illustrated embodiments, this wall is

  appreciably smooth and devoid of discontinuities.

  In FIG. 1, 2, 8 or 9, the tube 5 has a substantially circular section, transverse to the longitudinal direction X, and cylindrical with generator 15 substantially parallel to this longitudinal direction X. According to another embodiment not illustrated, the tube 5 has a section, transversely to its longitudinal direction X, substantially polygonal, for example dodecahedral. On the other hand, in FIGS. 5 and 6, the external peripheral wall of the tube 5 has a generator 15 inclined, from the inside towards the outside radially and from front to back in a direction of traction X of the case 7 according to the

longitudinal direction.

  With respect to this direction X, the generator 15 forms a

angle 16 of the order of 2 to 15.

  In FIG. 5, the angle 16 is of the order of 12. On the

  FIG. 6, this angle 16 is of the order of 7.

  This participates in an easy extraction of the tube 5 under

  the effect of the means 11, as explained below.

  The embodiment of Figure 9 provides that the device 1 comprises two tubes 5 and two cases 7 end-to-end longitudinally opposite respectively. Therefore, two substantially opposite traction means 11

longitudinally are provided here. Such an arrangement is practical, for example in the case of an element 2, of

  large dimension in the longitudinal direction X. In Figures 6 to 8, the tube 5 comprises removal means 17 after installation. These means 17 operate by separation from and / or separation into at least two bands 18

of tube 5.

  In FIG. 10, the same applies to the case 7.

  For example, the tube 5 -or the case 7- has two to

twelve bands 18.

  In FIG. 10, the means of removal 17 from the case 7 comprise twelve strips 18 to be moved away, substantially longitudinal and initially distinct, in this

example juxtaposed.

  In embodiments, the strips 18 are assembled, in particular when they are perpendicular to the longitudinal direction X, and therefore urged in the direction of their

separation during installation.

  In FIG. 8, the removal means 17 of the tube 5 comprise a single slot 19 for securing by elastic stapling of a single strip 18 whose edges

are to be removed.

  The slot 19 is here extended over the entire generator 15 of the tube 5, in the longitudinal direction X. Another embodiment provides that the removal means 17 of the tube 5 comprise at least two strips 18 to be separated,

  substantially longitudinal and previously unitary.

  In this example, the bands 18 are connected via a preferential rupture zone, substantially extended over an entire generatrix 15 of the tube 5, in the longitudinal direction X. According to one characteristic, the tube 5 comprises means for longitudinal grinding of the tube 5, in at least two

20 sections or tube rings 5.

  Due to their similar functions, the fragmentation means are designated here by the same reference

  digital 17, as the means of removal.

  For example, the tube 5 comprises from two to ten sections 20

tube 5.

  In the embodiment of FIGS. 6 and 7, the grinding means 17 comprise a segmentation system of sections 20 previously secured, by elastic stapling. Fragmentation means 17 shown in FIG. 8 comprise a system for segmenting two longitudinal sections 20, previously unitary, by breaking the

  tube 5 according to a preferential zone 21 peripheral.

  Let us now describe the method of fitting a tubular retractable element 2 onto a receptacle 3 using a

* installation device 1.

  This element 2 to be installed is initially mounted tensioned on the tube 5, and the relative sliding means 6, with a low coefficient of friction, temporarily secured by clamping and interposed between the tube 5 and the elastic element 2. The mounting on the tube 5 of the element 2 is typically

carried out in the factory.

  The method then provides for threading of the device 1 on the receptacle 3 so that the retractable element 2 is

  brought to the right of its precise destination location.

  Then it is necessary to evacuate the tube 5 so that, as it is withdrawn, the retractable element 2 comes

conform to receptacle 3.

  To do this, the operator installing the element 2: - holds for example with one hand the element 2 retractable to its precise destination location; and - exerts, for example with the other hand, on the traction means 11, in particular the flexible unitary case 7, an effort

rearward traction.

  In the figures, this effort is illustrated by the arrows X. On the one hand this effort X ensures the installation of the element 2

retractable on the receptacle 3.

  On the other hand, it causes the simultaneous evacuation of the tube 5 with the case 7. The installation is therefore carried out substantially without effort by

  the operator directly on the tube 5.

  It is thus allowed that the case 7 does not remain partly under the element 2 once the tube 5 has been extracted, which avoids trapping air bubbles or damaging the constituents of this element 2, such as the sealant rings 22 visible in Figures 1 and 2. This is a sealant ring 22

sealing.

  In these figures, the ring 22 is disposed between the outside of the case 7 and a sheath in material sock

  elastic synthetic 23 of element 2.

  In Figures 3 and 4, there is provided at the front a ring 22 of sealing mastic, and towards the rear a tubular layer

  24 of field distribution putty.

  Figure 9 shows a pose with a device 1 comprising

  two tubes 5 and cases 7 end-to-end.

  This pose provides that is exercised, successively (for example by a single operator) or simultaneously (for example by two operators), on two traction means 11 substantially opposite longitudinally, respectively

an effort X and X '.

  Each effort X or X 'is here directed towards the rear of the tube

  5 corresponding, in reverse.

  Following the installation of the element 2, is provided with the tubes 5 of Figures 5 to 8 a step of removal or evacuation of

  this tube 5 removed and / or from the case 7 removed.

  This phase is carried out, as the case may be, by distancing or separating bands 18 the latter over its entire longitudinal dimension X, along at least one slot 19 capable of allowing, once separated, passage through

  from it, from the receptacle 3 with the retractable element 2 placed.

  In one embodiment, the step of removing the tube 5 comprises at least one phase of relative separation, for example tangential, of at least two strips 18 of initially distinct longitudinal tube 5, having previously been part of, or constituting the tube 5, by juxtaposition

  and / or assembly, for example by elastic stapling.

  The embodiment of FIG. 8 provides that the step of removing the tube 5 includes a mutual separation phase, for example radial, of at least two edges of

18 longitudinal unitary bands.

  Such bands can for example be connected by a

  preferential rupture zone 21.

  But here they are by elastic stapling.

  In the embodiment of FIG. 10 o the means for removing the case 7 comprise at least two bands 18, and the pulling step exerted on the case 7 is in particular carried out by handling by an operator of

  these bands 18 arranged in a graspable braid.

  With the tube of Figure 6 or 7, following the installation of the elastic element 2, is planned a fragmentation step

  longitudinal of the tube 5, in several sections 20.

  According to the embodiments, the fragmentation step comprises at least one phase of segmenting the sections 20 of tube 5 previously secured, for example by elastic stapling. The same applies to the previously unitary sections 20, for example via at least one rupture zone

  preferential 21, as in FIG. 8.

  Obviously, the invention also relates to assembly 4 obtained by implementing the process which has just been described and / or

at least one device 1.

  In embodiments not shown: - the tube 5 consists of several pieces, if access is limited in front of the end; - the tube is split to extract it, if there is a passing cable; or - the end of the case 7 can be fixed to a stop

  against which the end of the sheath 23 is supported.

Claims (21)

  1. Method for laying at least one tubular retractable element (2) on a receptacle (3) such as cable or the like, at a precise destination location and using a laying device (1) which comprises at least one hollow rigid tube (5) on the outside of which the element (2) to be laid is initially tensioned, and relative sliding means (6) with low coefficient of friction between the tube (5) and the elastic element (2); the method provides for threading of the device (1) on the receptacle (3) so that the element (2) is brought to the right of its destination location, then the evacuation of the tube (5) so that as and as it is removed, the element (2) comes to conform to the receptacle (3); characterized in that the element (2) is installed, maintaining this element (2) in its destination location; and acting on traction means (11), essentially comprising a flexible unitary case (7) made of substantially inextensible synthetic material, extended externally over at least part of the tube (5) to form a free external end for receiving the element (2), and internally from a cuff hem (10) up to the proximity of a rear end or end piece (9) of the tube (5) directly or by means of flexible internal straps (14), a force ( X, X ') of rearward traction which, on the one hand ensures the installation of the element (2) on the receptacle (3) and on the other hand causes the simultaneous evacuation of the tube (5) with the '' case (7). 2. Method according to claim 1, characterized in that, in particular in the case of a long element (2), with a   device (1) comprising two tubes (5) and cases (7)   longitudinally substantially opposite, either exerted, successively or simultaneously, on two traction means (11) substantially opposite longitudinally, respectively a force (X, X ') towards the rear, in a reverse.   3. Method according to claim 1 or 2, characterized in that, after the installation of the retractable element (2), there is provided a step of removing or evacuating the evacuated tube (5) and / or the 'case (7) removed by distance and / or separation of bands (18) the latter over its entire longitudinal dimension (X), along at least one slot (19) adapted to allow once moved, the passage to through her,   of the receptacle (3) with the element (2) placed.   4. Method according to claim 3, characterized in that the step of removing the tube (5) comprises at least one phase of relative separation, for example tangential, of at least two strips (18) of tube (5) initially distinct longitudinal, having previously been part of, or constituting the tube (5), by juxtaposition and / or   assembly, for example by elastic stapling.   5. Method according to claim 3 or 4, characterized in that the step of removing the tube (5) comprises at least one phase of mutual separation, for example radial, of at least two edges of unitary longitudinal strips (18) , for example connected by a preferential rupture zone (21).   6. Method according to one of claims 3 to 5,   characterized in that the means for removing the case (7) comprising at least two bands (18), the pulling step exerted on the case (7) is in particular carried out by grip by a band operator (18) arranged in a prehensible braid.   7. Method according to one of claims 1 to 6,   characterized in that, following the installation of the elastic element (2), a step of longitudinal fragmentation of the tube (5) is provided, in at least two sections (20) or tube rings (5).   8. Method according to claim 7, characterized in that the splitting step comprises at least one phase of segmenting sections (20) of tube (5) previously secured, for example by elastic stapling and / or sections previously unitary by example via at least   a preferential rupture zone (21).   9. Device (1) for placing at least one tubular retractable element (2) on a receptacle (3) such as cable or the like, at a precise destination location on the receptacle (3), this device (1) comprising at least: - a hollow rigid tube (5) able to be freely threaded on the receptacle (3) and on the outside of which the element (2) to be placed is initially tensioned; and - sliding means (6) relating to low coefficient of friction, temporarily secured by clamping and interposed between the tube (5) and the element (2); this device (1) allowing threading on the receptacle (3) of the element (2) in line with its destination location, then the evacuation of the tube (5) so that the element (2) comes to conform to the receptacle (3); characterized in that the relative sliding means (6) comprise a flexible unitary case (7) of substantially inextensible synthetic material, extended externally over at least part of the tube (5) to form a free external end for receiving the element (2), and extended internally from a cuff hem (10) to near a rear end or end piece (9) of the tube (5) directly or by means of flexible internal straps (14), to form traction means (11) on the case 7, while the external peripheral wall of the tube (5) is substantially devoid of gripping means such as projection and / or through cavity.   10. Device (1) according to claim 9, characterized in that the external peripheral wall of the tube (5) is   appreciably smooth and devoid of discontinuity.   11. Device (1) according to claim 9 or 10, characterized in that the tube (5) has a substantially circular section, transverse to its longitudinal direction (X), and for example cylindrical with generator   (15) substantially parallel to this direction (X).   12. Device (1) according to claim 9 or 10, characterized in that the tube (5) has a section, transverse to its longitudinal direction (X),   substantially polygonal, for example dodecahedral.   13. Device (1) according to one of claims 9 to 12,   characterized in that the external peripheral wall of the tube (5) has a generator (15) inclined, from the inside towards the outside radially and from front to back in a direction (X) of traction of the case (7 ) in the longitudinal direction, with respect thereto, by an angle (16) of   on the order of 2 to 15, and for example on the order of 7 to 80.   14. Device (1) according to one of claims 9 to 13,   characterized in that, in particular in the case of a long element (2), the device (1) comprises two tubes (5) as well as two cases (7) end to end longitudinally opposite each other, and therefore two means (11 ) traction   substantially opposite longitudinally.   15. Device (1) according to one of claims 9 to 12,   characterized in that the tube (5) and / or the case (7) comprises removal means (17) after installation by separation from and / or separation into at least two strips (18), respectively from the tube (5 ) and / or the case (7), for example, the tube (5) and / or the case (7) comprises from two to twelve bands (18).   16. Device (1) according to claim 15, characterized in that the removal means (17) of the tube (5) comprise at least two bands (18) to be moved away, substantially longitudinal and initially distinct, for example juxtaposed and / or assembled, for example the removal means (17) of the tube (5) comprise at least one slot (19) for securing by elastic stapling of strips (18) to be moved away, substantially extended over a whole generator (15) of the tube (5), following the direction longitudinal (X).   17. Device (1) according to claim 15 or 16, characterized in that the removal means (17) of the tube (5) comprise at least two strips (18) to be separated, substantially longitudinal and previously unitary, for example, the bands (18) are connected via a preferential rupture zone (21), substantially extended over an entire generator (15) of the tube (5), in the direction longitudinal (X).   18. Device (1) according to one of claims 9 to 17,   characterized in that the tube (5) comprises means for fragmenting (17) the tube (5) longitudinally, into at least two sections (20) or tube rings (5), for example, the   tube (5) has two to ten sections (20).   19. Device (1) according to claim 18, characterized in that the splitting means (17) comprise a segmentation system, for example of sections (20) previously secured by elastic stapling and / or of previously unitary sections by rupture following a preferential zone (21).   20. Device (1) according to one of claims 1 to 19   characterized in that the case (7) is internally extended towards the rear by at least two flexible strips (14), for example two strips (14) are each fixed to the case (7) to form two gripping handles , the fixing points (25) being substantially evenly distributed over the internal periphery of the rear end of the case (7). 21. Assembly (4) obtained by implementing the method   according to one of claims 1 to 9 and / or comprising at   at least one device (1) according to one of claims 10 to 20.